Here is the full list of all 14 Flower achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Bloom 10,000 flowers.
Take a ten minute break between any dreams.
Release all of the names to the sky.
Play the game after a week long break.
Beyond all flowers lies another room.
Completely awaken the city.
Reminisce for three minutes before returning to the room.
Journey to the city unscathed.
The dream has just started...
Light a darkened pool.
Play with the windmills and ride the wind seven times.
Life could be simple...
Use the grass as your canvas and paint the ground with three different colors.
Find and bloom a secret flower.